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Hey i would like to ask is the rich snippets play a vital role in SEO or not?

You should add various blog post , with the collection of inbound and outbound links which will definitely increase rate of backlinks. I generally go through this task.

But we cannot add daily sitemap

You need to do extra work as google site submit gone. I think this is gone just because of extra overloading of work. And pressure google to crawl but now we will focus only those which crawl daily and suitable data over its website and submit our content over it.